Buffing wheel blank plies



Feb. 28, 1933- H. ZIMMERMAN BUFFING WHEEL BLANK PLIES Filed Sept. 25,1950 .Inu EIltDI' Harry Zimmerman blanks when they are laid out upon thelength Patented-Feb. 28, 1933' mm: PATENT?OFFICE},

HARRY zmmnmir, or romnrqowmmo, oaimnacassrenoa To BEULAH 1min:

zmmnm l'an or rononro, oiqranro, NADA L nmme wnann BLANK. runs'Appllcatienflled September 25, 1930. Serial m.-484'=,4s1..

My invention relates .to improvements Wastageof material whichoccurs inthe cutmethods for cutting. bufling :wheel blank plies from lengths ofmaterial,and is particularly directed towards the type of blank, fromwhich a pleated regular hexagon shaped bufi ing wheel plyisformed. I

In this type of blankas shown in United States Letters Patent No.1,669,224,:May 8th,

1928, to Frank Yerges, the blank is of elon-c;

gatedform, cut onthe bias inrespect to the weave and folded intoparallel pleats soithati the resultant form of plyis substantiallycircular. I a

The object of my present invention is to form the blanks of such a shapethat they are complementarytoeach other, in that there is no waste ofmaterial between adjacent of material from which they are .cut

'A further object of my inventlon is to so position the blanks inrelation to the length A'still further and particular object of myinvention is toform myblanksof a plurality of substantiallyindenticalhexagonal figures each having two opposite parallel-sides ofthe samelength as the sides of the regular pleated hexagon forming the ply, andthe other four sides equal to each other, and of reater length than thesides of the hexagon p y.

My invention consists of a method for cut ting blanks all as hereinaftermore partlcularly described and illustrated in the ac-,

companying drawing in which Fig. 1 illustrates a length of materialhaving large sized hexagonal blanks formed therein, whereinno wastage ofmaterial 0c curs between the, complementary blanks;

Fig. 2is a similar viewto Fig. 1, the material having small sizedhexagonal, blanks formed therein. i

' Fig. 3 illustrates a length. of materialhaving octagonal blanks formedthBIGlIl and from. which pleated octagonal bufl blanks can be made, suchfigure however showing the ting of octagonal blanks. 4 Fig.- 4illustrates a hexagonal blank formed by joining two partialblank-portions, and

Fig. 5 illustrates a pleated hexagonal ply materialQ from which theyarecut, it will be clearly seen that these blanks. 1 Cannot be positionedin any way. complementary to each other, so that there is no wastage ofmaterial between the blanks, there being in fact" a large waste ofmaterial?) in'proportion'to the 7 area of the blanks. This type of blankis of course integral and can be formed into a pleated-ply of octagonform.

.,In my invention as illustrated in Figs. 1,. 2,4 and 5 I show the useof blanks of hexw agonal form, the blanks 4 illustrated in Fig. 1 beingof greater length than the diagonal width of the length of material 5across which they extend so that the blanks are cut froln, the materialin the form of partial blanks, the partial blanks being joined togetherto form complete blankssuch as illus.-. trated inFig- 4.

In, laying out blanks in relation to the.

length of material for the production of blanks whichare on the bias tothe we ave,,I

place two blanks, for example, 4 and 4,? end to end, and lay such blanksin diagonal relation to the width of material so thatthe longitudinalcenter line X passing through the blanks from edge to edge of thematerial is equal to the lengthof a complete blank.

By-this method the portions 4 and 4 will of course make a completehexagonal blank 7 upon being joined together. The other blankscomplementary to the blanks 4i and. 4 are also complementary toeachother, and

when the end to end portions are joinedtogether will formcompleteblanks,for example, when the portion at is-secured to the end of the partialblank/i? 1a completehex-i, agonal blank will be formed. 7 c

Upon further reference to Fig. 1 is will be seen that in cutting theblanks of hexagonal form and in accordance with my method that there isabsolutely no wastage of material between the complementary blanks, andthat the only wastage in the material length will be as the ends whichof course may be very far apart, wherein a certainwastage must occur, asof course there is not suificient' material at these points to permitthe forming of partial blanks of the same size as the. blanks throughoutthe length of material. These waste portions can however be used formaking smaller sized blanks. V j V It will of course be appreciated-thatin many cases it is advantageous to produce comparatively small blanks 8from material of the same width as the material illustrated in Fig. 1,and in such a case as illustrated in Fig. 2 the blanks can be so laidout upon the material that instead of the edges of the material passingthrough two blanks which are laid end to end, that it is possible tohave a'central integral blank 8 and two partial blanks 8 and 8 extendingfrom the ends of the integral blank. In laying out these blanks asillustrated in Fig. 21 place the integral blank 8 and the partial blanks8 and 8 in diagonal relation to the width of the material so that thelongitudinal central line Y passing through the blanks from edge to edgeof the material is equal to the length of two complete blanks. The otherblanks are complementary to the blanks 8 8 and 8 and are alsocomplementary to each other,

and when the portions bounded by the edges of the material are joinedtog-ether will form complete hexagonal blanks." The partial blanks aresewn or otherwise secured together as illustrated in Fig. 4, and

are then pleated into the form illustrated in Fig. 5. The sides of theblank illustrated in Fig. 4 being of course the sides of the blankillustrated in Fig. 5 after such blankj is pleated.

It will be apparent in the use of my particular method for cuttingblanks of the form described that I need only use material of a standardwidth from which blanks of any desired size may be cut, thus obviatingthe necessity of stocking materials of different widths for themanufacture of different sized blanks. It will of course be alsounderstood that after the blanks are pleated and sewn that the centersor arbours are punched there in and the peripheries and blanks cut intocircular form. 7

From the foregoing description it will be apparent that I have devisedan extremely efiective method of cutting blanks'of the characterdescribed from lengths of material wherein no wastage of materialbetween the" complementary blanks occurs, and although I have shown anddescribed my blanks as set in a particularrelation to the length ofvention which contemplates the use of a hexagonal blank and the layingout of such blanks upon the length of material in complementary blankform. v

What I claim as myinvention is:

' i A blank for-a pleated butting wheel ply of regular hexagon form,comprising a hexagonal piece of material having all its angles iobtuseangles,- two sides of which are the same length as the sides of theregular hexagon pleated blank and the other four sides 0 which are equalto each other and of greater length than the sides of the regular hexaon and. adapted to be shortened by the p eats. Y i Q 2. A method offorming abufiing wheel ply of aplurality oflequal blanks of elongatedhexagon form, comprising the cutting out-of the blanks by a plurality ofcuts, each cut forming an edge of each of two adjacent blanks,- some ofthe blanks being complete and some of the blanks incomplete where theyare bounded by the edges of the material from which the blanks are cut,joining the complementary portions of incomplete blanks to form completeblanks, pleating the complete blanks crosswise of their length so thatthey are reduced to substantially regular hexagon form, and laying aplurality of such pleated blanks together to form the bufiing wheel ply.

3. A method of forming a bufiing wheel ply of a plurality of equalblanks of elongated hexagon form, in which two sides are equal and theother four sides equal to each other and of greater length than the twosides, comprising, the cutting out of the blanks by a plurality of cuts,each out forming an edge of each of two adjacent blanks,

some of the blanks beingcomplete and some of the blanks incomplete wherethey are bounded by the edges of the material from which the blanks arecut, joining the com plementary portions of incomplete blanks to form'complete'blanks, pleating the complete HARRY ZIMMERM'AN.

